Re: [PATCH][Fix] swsusp: avoid possible page tables corruption during resume on x86-64

[Pavel Machek <pavel@suse.cz>]

Hi!

> Summary =========
> The following patch makes swsusp avoid the possible temporary corruption of
> page translation tables during resume on x86-64.  This is achieved by creating
> a copy of the relevant page tables that will not be modified by swsusp and can
> be safely used by it on resume.

Andi, this means swsusp fails 50% of time on x86-64. I believe we even
have one report in suse bugzilla by now... Could we get this somehow
merged?


> Index: linux-2.6.14-rc3-git5/kernel/power/swsusp.c
> ===================================================================
> --- linux-2.6.14-rc3-git5.orig/kernel/power/swsusp.c	2005-10-05 21:12:41.000000000 +0200
> +++ linux-2.6.14-rc3-git5/kernel/power/swsusp.c	2005-10-05 21:24:50.000000000 +0200
> @@ -672,7 +672,6 @@
>  		return 0;
>  
>  	page = pfn_to_page(pfn);
> -	BUG_ON(PageReserved(page) && PageNosave(page));
>  	if (PageNosave(page))
>  		return 0;
>  	if (PageReserved(page) && pfn_is_nosave(pfn)) {

Rafael, are you sure? This will clash with snapshot.c split and
probably belongs to some other patch.
								Pavel
-- 
if you have sharp zaurus hardware you don't need... you know my address
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